Djangoimportexport如何将用户信息传递给ForeignKeyWidget？

Question

我需要以某种方式将用户信息从资源类传递到ForeignKeyWidget类，我在其中创建ForeignKey对象：

class CompanyWidget(ForeignKeyWidget):

    def clean(self, value, row=None, *args, **kwargs):
        print(self.user, file=sys.stderr)
        if not value:
            return None
        else:
            obj, _ = Company.objects.get_or_create(
                name=value,
                created_by='I NEED USER INFORMATION HERE SOMEHOW',

            )
        return obj

最好的方法是什么

---

我试着自己解决这个问题，结果很接近，但无法解决最后一个难题。您可以重写资源中的__init__ 类并从中获取用户信息。然后，我不知道如何将这个self.user信息传递到类变量company

代码如下：

class ContactResource(resources.ModelResource):
    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user', None)
        super(ContactResource, self).__init__(*args, **kwargs)

    company = fields.Field(
        column_name='company',
        attribute='company',
        widget=CompanyWidget(model=Company, field='name', user='I NEED TO PASS USER HERE FROM __INIT__'))

    def after_import_instance(self, instance, new, **kwargs):
        instance.created_by = kwargs['user']

如果我设法在company变量的**kwargs中传递用户信息，那么我可以通过重写ForeignKeyWidget的__init__类在下游使用它：

class CompanyWidget(ForeignKeyWidget):
    def __init__(self, model, field='pk', *args, **kwargs):
        self.model = model
        self.field = field
        self.user = kwargs.pop('user', None)
        super(CompanyWidget, self).__init__(model, *args, **kwargs)

    def clean(self, value, row=None, *args, **kwargs):
        print(self.user, file=sys.stderr)
        if not value:
            return None
        else:
            obj, _ = Company.objects.get_or_create(
                name=value,
                created_by=self.user,

            )
        return obj

任何帮助都将不胜感激，我花了很长时间才来到这里，我觉得我真的很接近。先谢谢你

Answer 1

事实证明，根本不使用ForeignKeyWidget就可以更容易地实现这一点。 如果您有多个外键，这些外键不是唯一的，但具有相同的名称（在我的示例中，是由不同用户创建的相同公司名称），则可以通过以下方式解决此问题：

类ContactResource（resources.ModelResource）：

def __init__(self, *args, **kwargs):
    self.user = kwargs.pop('user', None)
    super(ContactResource, self).__init__(*args, **kwargs)

company = fields.Field(column_name='company')

class Meta:
    model = Contact
    skip_unchanged = True
    report_skipped = True
    exclude =('is_active', 'created_by')
    export_order = ('id','first_name','last_name','email','phone','address','description','company','created_on','website','job_title','birthday')

def after_import_instance(self, instance, new, **kwargs):
    instance.created_by = self.user # kwargs['user']

def import_field(self, field, obj, data):
    field_name = self.get_field_name(field)
    method = getattr(self, 'clean_%s' % field_name, None)
    if method is not None:
        obj = method(field, obj, data)
    super(ContactResource, self).import_field(field, obj, data)

def clean_company(self, field, obj, data):
    name = data[field.column_name]
    company, created = Company.objects.get_or_create(name=name, created_by=self.user)
    obj.company = company
    return obj